Small Hand revolution Counter

Small Hand revolution Counter by the Connecticut Cutlery Co., and used by J. Penn and Sons, London

This is an early form of counter, the driving spindle of which is held, by hand, in contact with the end of the shaft of which the revolutions are to be counted. The mechanism is contained in a circular brass case having the driving spindle projecting from one edge, while a handle is attached to the opposite point of the circumference. Inside the casing a worm on the spindle drives a worm-wheel to the axis of which an index is attached; this index moves over a dial having 100 divisions, each representing one revolution of the driving spindle. A second index is driven intermittently by a pin on the worm-wheel at one-tenth the speed of the first, so that it registers hundreds of revolutions up to a total of 1,000 rev.